Where did my options go?

I'm playing on a university lot right now and all my options have disappeared. Okay, so not all of them, but most. All the ones that have to do with university except research, actually. And an error message pops up when the sims are supposed to go to class or finals. I tried to get them to go manually, but there were no options to do that. Both my sims ended up getting C+ even though they had the bar filled to A+ because they couldn't go. How do I fix this?!?!?

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GameSpot Walkthrough

The Sims 2 Walkthrough
Sometimes putting other people's lives in order is more fun than managing your own. This guide to the Sims 2 will help you do that, with tips on building your sim, creating your house, and managing your sims.
- Go to Online Walkthrough »

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